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Finding the Fourth Proportional to 1,031.87, 1,422.73 and 717.40

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Solution

The fourth proportional to 1,031.87, 1,422.73 and 717.40 is: 989.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.87 : 1,422.73 = 717.40 : x
  2. Step 2: Convert to fraction form
    1,031.87/1,422.73 = 717.40/x
  3. Step 3: Cross multiply
    1,031.87x = 1,422.73 × 717.40
  4. Step 4: Simplify right side
    1,031.87x = 1,020,661.15
  5. Step 5: Solve for x
    x = 1,020,661.15/1,031.87
  6. Step 6: Final answer
    x = 989.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.